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# Study on Method of Integrating Earth Object in Large Based on Ellipsoid Surfacespecialty

Author: CaoZuo
Tutor: LiangMing
School: Xi'an University of Science and Technology
Course: Geodesy and Survey Engineering
Keywords: Small-scale maps Coordinate transformation Vectorization
CLC: P283
Type: Master's thesis
Year: 2013
Downloads: 17
Quote: 0
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### Abstract

 Be affected of the traditional cartography, almost all GIS and digital maps are using thetraditional map projection theory. In the process of the ellipsoidal coordinates convert to planecoordinates, it will inevitably produce position, orientation, size and other aspects ofdeformation. In order to form a complete map, it is often necessary to use mathematicalmeans to compress or stretch the latitude and longitude lines, including using manycorrections to solve the difference between the plane coordinates and the actual physicalgeometrical position. In preparing the map, in order to make the area within the projectionminimal variation, different countries and regions often use different projection methods,which resulted in data between countries or regions are difficult to cohersion. The traditionalmap take projection space as their mathematical reference base, which is feasible in certainapplications, within the local area. When the scope of map expression ranging from smallregional extended to large regional or global, the traditional projection can not meet the needsof continuous multi-resolution digital earth and comprehensive.Professor Yang Yongchong proposes to collecte the data based on the ellipsoid geodeticcoordinates, and the idea of digital mapping expressing the surface of the object on theellipsoid surface. In the computer, in accordance with the shape and size of reference ellipsoidmaking spherical, the earthâ€™s surface object in the drawing area expressed on it, to makeellipsoid electronic map.Based on this theory, this paper focuses on the small scale of the map, to extractegeographic coordinates data. This article uses the South cass software, and according to the scanned map which based on the five northwestern provinces to establish an independentcoordinate system and vector images. Choose a common point in neighboring provinces onthe digital map, work out geographical coordinates of the common points, and conductcomparative test in order to determine data usability. Take this way as the data source ofellipsoid electronic map.

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